netdev - Re: checkentry function

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Message-ID: <1286259838.2457.11.camel@edumazet-laptop>
Date:	Tue, 05 Oct 2010 08:23:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nicola Padovano <nicola.padovano@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: checkentry function

Le mardi 05 octobre 2010 à 08:11 +0200, Nicola Padovano a écrit :
> >
> > Negative (ie < 0) is used for error numbers. This is confusing
> > because in older kernels the checkentry returned a bool which
> > is defined as 1 okay and 0 for error.
> >
> ok i see.
> 
> and why i have this output?
> DEBUG: the tablename (not FILTER) is: �%H �
> 
> I want block my target if the table name is NOT filter...so i write:
> 
> [CODE]
> ...
>  if (strcmp(tablename, "filter"))   {
>    printk(KERN_INFO "DEBUG: the tablename (not FILTER) is %s\n",tablename);
>    return ERROR_VALUE; // < 0
>  }
> [/CODE]
> 
> but in the tablename variable i haven't the table's right value (but i
> have: �%H � a wrong value)...what's the problem?
> 
> 

Because xxx_check() signature is not the one you use.

Could you read source code of _current_ existing modules , and use
copy/paste ?

static int hashlimit_mt_check(const struct xt_mtchk_param *par)
{
...
}



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